>So what's the meaning of the endings "erpeton" and "gyrinus" common to a > lot of early tetrapods.Thanks for your ansqers Greek _herpetos_, from the Greek, "creeper" (or "crawler") - a reference to reptilian affinities (as for Reptile: from Latin _reptilis_, from _repere_, _reptum_, "to creep"). Greek _gyrinos_, from the Greek, "tadpole" - a reference to amphibian affinities.